1. Department of Metabolism, Endocrinology and Molecular Medicine, Osaka Metropolitan University Graduate School of Medicine, Osaka 545-8585, Japan
2. Department of Diabetes and Endocrinology, Osaka City Juso Hospital, Osaka 532-0034, Japan
3. Department of Medical Statistics, Osaka Metropolitan University Graduate School of Medicine, Osaka 545-8585, Japan
4. Department of Surgery, Osaka City Juso Hospital, Osaka 532-0034, Japan
5. Directors Office, Osaka City General Hospital, Osaka 534-0021, Japan